Definition: A reference to a controlled vocabulary of sequence regions, such as InterPro or Sequence Ontology (SO). Homepage at http://www.sequenceontology.org/. Browse at http://www.ebi.ac.uk/ontology-lookup/browse.do?ontName=SO
Source:http://www.biopax.org/release/biopax-level3.owl#SequenceRegionVocabulary